Micrometer-gage



' (No Model.)

J. P .,.LAV1GNB.

MIROMBTER GAGE.

Patented Feb. 20, 1894.

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UNITED STATES AfrnNfr JOSEPH P. LAVIGNE, OF NEV HAVEN, CONNECTICUT.

NllCROlVlETER-GAGE.

SPECIFICATION forming part of Letters Patent-No. 515,234, dated February 20, 1894.

Application filed January 7, 1893. Serial No.45'7,606. (No model.)

To all wwm/ it may concern.-

Be it known that I, JOSEPH P. LAvIeNE, of New Haven, in the county of New Haven and State of Connecticut, have invented new Improvements in Micrometer-Gages, (Case 13;) and I do hereby declare the following, when taken in connect-ion with accompanying drawings and the letters of reference marked thereon,to be afull, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Flgure l, a view in side elevation of a micrometer gage constructed in accordancewith my invention; Fig. 2, a View partly in elevation and partly in central longitudinal section thereof; Fig. 3, a view showing several depth-plugs such as may be used in converting the instrument into a depth gage.

My invention relates to animprovement in micrometer gages, the object being to produce a simple, durable, and accurate instrument, adapted to be readily converted into a depth-gage, and constructed to reduce the factor of wear in use to the minimum.

With these ends in view, my invention consists in a micrometer gage having certain details of construction and combinations of parts as will be hereinafter described, and pointed out in the claims.

The frame A, and beam B, of my improved device, have the general form of other instruments of thisclass, the beam being graduated, as at b, and receiving at its outer end a measuring screw C, the beveled inner edge of which is graduated, as at c, to co-operate with the graduations b, mentioned. A measuringscrew D, located within the beam, and threaded into the same, is reduced at its outer end, as at D', to receive the measuring-screw C, which is frictioned over its said hub D', whereby the said parts are coupled for rotation together. The inner end of the said screw is counter-bored as at D2, to receive the reduced inner end of ameasuring-plunger E, which is located within the beam, from which it projects at a point opposite the anvil F,'of the device instead of the screw which is ordinarily yprolonged to co-operate with the anvil. This plunger is reciprocated back and forth, being thereto pushed and pulled by the screw, the wear of reciprocation being much less than the wear of rotation. To connect the plunger and screw, I employ a couplingscrew G, which passes through a central longitudinal opening D3, formed to receive it in the measuring-screw D,'aud into a threaded counter-bore E', formed in the outer end of the plunger. the extremeinner end of the said screw G, being threaded to tit into the said threaded counter-bore. A spiral spring H, interposed between a shoulder g formed on the screw G, and a shoulder d, formed by enlarging the outer portion of the longitudinal opening D3, to provide a space for the spring, exerts a constant effort to keep the outer end of the plunger seated in the bottom of the cou nter-bore D2, fprmed in the inner end of the measuring-screw. -The said coupling-screw does not, it should be observed, rotate, but simply moves back and forth with the measuring screw and measuring sleeve. To prevent the measuring-plunger from rotating, its loweredge is constructed with a long grooveE2, which receives an adjustable key or feather I, the same being located in a pocket J, formed to receive it in the frame A. An opening J formed in the frame at a point opposite the pocket J and normally closed by the screwplug J2, is provided for the insertion and removal of the key I. An adj usting-screw K, having its inner end beveled vto engage with the outer'end of the key I, is mounted in the frame, and provides for adjusting the said key, as desired. It will be seen that under this construction the working face e, of the plunger is not rotated against the work, but simply moved into contact with the same. This constitutes an important point of advantage, as the rotation of the working face wears it appreciably, and that wear is by my invention avoided. The second part of my invention relates to the conversion of my improved tool into a depth-gage. With that end in view, the inner end of the measuringplunger is provided with a deep counter-bore E3, enlarged at its inner end as at e to form a dust pocket. Vith that end in view also, the adjustable anvil F, is provided with a central longitudinal opening F, corresponding in diameter to the diameter of the bore E3. The said opening and counter-bore adapt the instrument to interchangeably receive a IOO set of depth-plugs or rods L, L and L2, diiferentiated in length by inches. Preferably the inner ends of these rods are split a little, as at l, so as to be better retained in place in the counter-bore E3, of the measurin g-plun ger.

When it is desired to use the instrument as a depth-gage, one of the plugs L',is selected and passed first through the anvil, and then into the plunger, its outer end projecting beyond the outer end of the anvil. Now by turning the measuring sleeve, the plug may be moved back and forth to measure fractions of inches. Thus, if it is desired to measure a hole, say for illustration, about four inches in depth, a plug will be selected which when applied to theinstrument will have a projection of about four inches from the anvil.v The measuringscrew is then operated to measure the fractions of the inch below or above four inches, as the case may be.

In order to adapt the device to be used as a depth-gage, the outer, end of its frame A,is constructed with a long face A', the frame being for this purpose provided with what I shall term a foot A2. The said face A', is formed at a right angle to the measuringscrew and plunger, and to the anvil.

When itis desired to use the instrument for outside measurements in the ordinary way, the plug is removed.

My design is to accompany each instrument with a set of plugs differentiated in length by inches, and covering the range of Work which the instrument would be ordinarily called upon to do.

y I might, if preferred, connect the depthplugs with the measuring-plunger in some other way than as herein shown. Thus, a depth-plug, yoke-shaped at its inner end to straddle the frame might obviously be employed. Under such a construction the anvil would probably be made solid instead Of having a central longitudinal opening. I would therefore have it understood that I do not limit myself vto the exact construction herein shown and described, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A micrometer gage having a graduated beam, a measuring member located therein and adapted to. be reciprocated, means for locking the said member against rotation, a measuring screw entered into the beam, a nonrotatable coupling-screw passing through the measuring screw and entering the outer end of the measuring member which it couples with the measuring-screw, and a graduated sleeve connected with the measuring-screw for rotating the same, and iitting over the beam to co-operate with the graduationsthereof, substantially as set forth.

2. Almicrometer-gage having a non-rotatable measuring member constructed with a longitudinal groove, a measuring-screw for operating the same, a key entering the said groove to prevent the said member from rotating, and an adj usting-screw engaging with as described.

3. A micrometer-gage having a non-rotatablemeasuring member constructed with a longitudinal groove, a key entering the said groove to hold the said member against rotation, a measuring-screw for operating the said member, and a non-rotatable coupling-screw for coupling the said measuring-screw and head together, substantially as described, and whereby the said member is moved back and forth by the said measuring-screw.

4. A micrometer gage having a graduated beam, a measuring sleeve applied to the outer face thereof, a measuring-screw located within the beam and connected with the said sleeve, and a non-rotatable measuring plunger connected with the inner end of the said screw, substantially as described.

5. A micrometer gage having a beam furnished with graduations, a measuring sleeve located thereupon, a measuring-screw located sleeve, a non-rotatable measuring plunger located within the said sleeve and a non-rotatable coupling-screw connecting the said plunger and measuring-screw, substantially as dcscribed.

6. A micrometer gage having a beam provided with graduations, a measuring-sleeve cated within the beam and connected with the said sleeve, a non-rotatable measuring plunger also located within the beam, a non-rotatable coupling-screwpassing through the measuring-screw and into the outer end of the plunger, and a spring interposed between the said coupling and measuring-screws, and arranged to draw the measuring-screw and plunger together, substantially as described.

7. In a micrometer-gage, the combination with the frame thereof, of measuring devices applied thereto, and including a longitudinally movable measuring member or part, and a removable depth plug, the said measuring member or part being constructed at its outer end to have the inner end of the said plug temporarily connected with it, and the said plug being constructed to project beyond the said frame, substantially as described, and whereby the plug partakes of the movement of the said member.

8. In a micrometer-gage, the combination with the frame thereof, of measuring devices applied thereto and including a measuringscrew and a non-rotatable measuring plunger connected therewith, and partaking of the longitudinal movement thereof; and a removable depth plug, the outer end of the said plunger being constructed to have the inner end of the depth plug temporarily connected with it, and the said plug being constructed -to project beyond the frame of the instruthe outer end of the said key, substantiallyV within the beam and connected with the said IOO mounted thereupon, a measuring-screw lo- IIO ment, substantially as described, and Whereby the plug partakes of the movement of the plunger.

l9. In a micrometer-gage, the combination with the frame thereof, of measuring devices, lncludmg a measuring-screw, and a non-rotatable measuring plunger connected therewith, and partaking of the longitudinal movemeut thereof, and having a central longitudinal bore, an anvil constructed with a central longitudinal opening mounted in the said frame, and a removable depth plug constructed to be passed through the said anvil, and entered at its inner end into the bore formed 1 n the said plunger, While its outer end proJects through the anvil beyond the frame, substantially as set forth, and Whereby the said plug partakes of the movement of the plunger.

10. In a micrometer gage, the combination with a measuring plunger having its outer end counter-bored, and an anvil constructed with a central longitudinal opening, of a removable depth plug having its inner end split and adapted to be passed through the opening of the anvil and into the counter-bore of the plunger, substantially as described.

11. Ina micrometer-gage, the combination withthe frame thereof, of measuring devices applied thereto and including a measuringscrew and a non-rotatable measuring plunger connected therewith and partaking of the longitudinal movement thereof, and having a central longitudinal bore and a dust pocket located Within the same, an anvil mounted in the frame, and having a central longitudinal opening located in line with the bore of the plunger, and a removable depth plug constructed to have its inner end temporarily inserted into the bore of the plunger, and to pass through the opening in the anvil and project beyond the frame, substantially as set forth.

12. In a micrometer-gage, the combination with a frame provided at its outer end with a flat face, and a foot, both located at a right angle to its plane, of measuring devices applied to the said frame, and including a longitudinally movable measuring member, and a removable depth plug constructed to be temporarily connected with the outer end of the said member, and to project beyond the outer end of the frame, at a right angle with the said face and foot which support the frame While the instrument is being used as a depth gage, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

JOSEPH P. LAVIGNE.

Witnesses:

GEO. D. SEYMOUR, FRED C. EARLE. 

